//variables
int LED_PIN = 12; //integer variable type can be changed throughout the code
#define LED_PIN 12 //this is an unmodifiable variable
//can also use const int to create an unmodifiable variable
float a = 23.44; //non integer vaiable can be changed throughout code (can also use double instead of float)
bool b = true; //or false
String c = "hello world"; //you can also store text
long d = 3000000; //stores four bit compared to int which stores two bit

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_PIN, OUTPUT);
  
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(LED_PIN, HIGH);
  delay(1000);
  digitalWrite(LED_PIN, LOW);
  delay(1000);
}